So I just got a TH-50PX50U. With my old tv, I could use the receiver to power the speakers but I was able to control the volume through the tv. In other words, I would set the receiver's volume and it would remain at -30 or something like that, but I could use the tv's volume system to turn the volume up or down. I hope that made sense. I have made all the same connections and I believe that the only difference is the tv. Any ideas?